drivers/net/cxgbe/l2t.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018 Chelsio Communications.
   3  * All rights reserved.
   4  */
   5
   6 #include "base/common.h"
   7 #include "l2t.h"
   8
   9 /**
  10  * cxgbe_l2t_release - Release associated L2T entry
  11  * @e: L2T entry to release
  12  *
  13  * Releases ref count and frees up an L2T entry from L2T table
  14  */
  15 void cxgbe_l2t_release(struct l2t_entry *e)
  16 {
  17         if (rte_atomic32_read(&e->refcnt) != 0)
  18                 rte_atomic32_dec(&e->refcnt);
  19 }
  20
  21 /**
  22  * Process a CPL_L2T_WRITE_RPL. Note that the TID in the reply is really
  23  * the L2T index it refers to.
  24  */
  25 void do_l2t_write_rpl(struct adapter *adap, const struct cpl_l2t_write_rpl *rpl)
  26 {
  27         struct l2t_data *d = adap->l2t;
  28         unsigned int tid = GET_TID(rpl);
  29         unsigned int l2t_idx = tid % L2T_SIZE;
  30
  31         if (unlikely(rpl->status != CPL_ERR_NONE)) {
  32                 dev_err(adap,
  33                         "Unexpected L2T_WRITE_RPL status %u for entry %u\n",
  34                         rpl->status, l2t_idx);
  35                 return;
  36         }
  37
  38         if (tid & F_SYNC_WR) {
  39                 struct l2t_entry *e = &d->l2tab[l2t_idx - d->l2t_start];
  40
  41                 t4_os_lock(&e->lock);
  42                 if (e->state != L2T_STATE_SWITCHING)
  43                         e->state = L2T_STATE_VALID;
  44                 t4_os_unlock(&e->lock);
  45         }
  46 }
  47
  48 /**
  49  * Write an L2T entry.  Must be called with the entry locked.
  50  * The write may be synchronous or asynchronous.
  51  */
  52 static int write_l2e(struct rte_eth_dev *dev, struct l2t_entry *e, int sync,
  53                      bool loopback, bool arpmiss)
  54 {
  55         struct adapter *adap = ethdev2adap(dev);
  56         struct l2t_data *d = adap->l2t;
  57         struct rte_mbuf *mbuf;
  58         struct cpl_l2t_write_req *req;
  59         struct sge_ctrl_txq *ctrlq;
  60         unsigned int l2t_idx = e->idx + d->l2t_start;
  61         unsigned int port_id = ethdev2pinfo(dev)->port_id;
  62
  63         ctrlq = &adap->sge.ctrlq[port_id];
  64         mbuf = rte_pktmbuf_alloc(ctrlq->mb_pool);
  65         if (!mbuf)
  66                 return -ENOMEM;
  67
  68         mbuf->data_len = sizeof(*req);
  69         mbuf->pkt_len = mbuf->data_len;
  70
  71         req = rte_pktmbuf_mtod(mbuf, struct cpl_l2t_write_req *);
  72         INIT_TP_WR(req, 0);
  73
  74         OPCODE_TID(req) =
  75                 cpu_to_be32(MK_OPCODE_TID(CPL_L2T_WRITE_REQ,
  76                                           l2t_idx | V_SYNC_WR(sync) |
  77                                           V_TID_QID(adap->sge.fw_evtq.abs_id)));
  78         req->params = cpu_to_be16(V_L2T_W_PORT(e->lport) |
  79                                   V_L2T_W_LPBK(loopback) |
  80                                   V_L2T_W_ARPMISS(arpmiss) |
  81                                   V_L2T_W_NOREPLY(!sync));
  82         req->l2t_idx = cpu_to_be16(l2t_idx);
  83         req->vlan = cpu_to_be16(e->vlan);
  84         rte_memcpy(req->dst_mac, e->dmac, RTE_ETHER_ADDR_LEN);
  85
  86         if (loopback)
  87                 memset(req->dst_mac, 0, RTE_ETHER_ADDR_LEN);
  88
  89         t4_mgmt_tx(ctrlq, mbuf);
  90
  91         if (sync && e->state != L2T_STATE_SWITCHING)
  92                 e->state = L2T_STATE_SYNC_WRITE;
  93
  94         return 0;
  95 }
  96
  97 /**
  98  * find_or_alloc_l2e - Find/Allocate a free L2T entry
  99  * @d: L2T table
 100  * @vlan: VLAN id to compare/add
 101  * @port: port id to compare/add
 102  * @dmac: Destination MAC address to compare/add
 103  * Returns pointer to the L2T entry found/created
 104  *
 105  * Finds/Allocates an L2T entry to be used by switching rule of a filter.
 106  */
 107 static struct l2t_entry *find_or_alloc_l2e(struct l2t_data *d, u16 vlan,
 108                                            u8 port, u8 *dmac)
 109 {
 110         struct l2t_entry *end, *e;
 111         struct l2t_entry *first_free = NULL;
 112
 113         for (e = &d->l2tab[0], end = &d->l2tab[d->l2t_size]; e != end; ++e) {
 114                 if (rte_atomic32_read(&e->refcnt) == 0) {
 115                         if (!first_free)
 116                                 first_free = e;
 117                 } else {
 118                         if (e->state == L2T_STATE_SWITCHING) {
 119                                 if ((!memcmp(e->dmac, dmac, RTE_ETHER_ADDR_LEN)) &&
 120                                     e->vlan == vlan && e->lport == port)
 121                                         goto exists;
 122                         }
 123                 }
 124         }
 125
 126         if (first_free) {
 127                 e = first_free;
 128                 goto found;
 129         }
 130
 131         return NULL;
 132
 133 found:
 134         e->state = L2T_STATE_UNUSED;
 135
 136 exists:
 137         return e;
 138 }
 139
 140 static struct l2t_entry *t4_l2t_alloc_switching(struct rte_eth_dev *dev,
 141                                                 u16 vlan, u8 port,
 142                                                 u8 *eth_addr)
 143 {
 144         struct adapter *adap = ethdev2adap(dev);
 145         struct l2t_data *d = adap->l2t;
 146         struct l2t_entry *e;
 147         int ret = 0;
 148
 149         t4_os_write_lock(&d->lock);
 150         e = find_or_alloc_l2e(d, vlan, port, eth_addr);
 151         if (e) {
 152                 t4_os_lock(&e->lock);
 153                 if (!rte_atomic32_read(&e->refcnt)) {
 154                         e->state = L2T_STATE_SWITCHING;
 155                         e->vlan = vlan;
 156                         e->lport = port;
 157                         rte_memcpy(e->dmac, eth_addr, RTE_ETHER_ADDR_LEN);
 158                         rte_atomic32_set(&e->refcnt, 1);
 159                         ret = write_l2e(dev, e, 0, !L2T_LPBK, !L2T_ARPMISS);
 160                         if (ret < 0)
 161                                 dev_debug(adap, "Failed to write L2T entry: %d",
 162                                           ret);
 163                 } else {
 164                         rte_atomic32_inc(&e->refcnt);
 165                 }
 166                 t4_os_unlock(&e->lock);
 167         }
 168         t4_os_write_unlock(&d->lock);
 169
 170         return ret ? NULL : e;
 171 }
 172
 173 /**
 174  * cxgbe_l2t_alloc_switching - Allocate a L2T entry for switching rule
 175  * @dev: rte_eth_dev pointer
 176  * @vlan: VLAN Id
 177  * @port: Associated port
 178  * @dmac: Destination MAC address to add to L2T
 179  * Returns pointer to the allocated l2t entry
 180  *
 181  * Allocates a L2T entry for use by switching rule of a filter
 182  */
 183 struct l2t_entry *cxgbe_l2t_alloc_switching(struct rte_eth_dev *dev, u16 vlan,
 184                                             u8 port, u8 *dmac)
 185 {
 186         return t4_l2t_alloc_switching(dev, vlan, port, dmac);
 187 }
 188
 189 /**
 190  * Initialize L2 Table
 191  */
 192 struct l2t_data *t4_init_l2t(unsigned int l2t_start, unsigned int l2t_end)
 193 {
 194         unsigned int l2t_size;
 195         unsigned int i;
 196         struct l2t_data *d;
 197
 198         if (l2t_start >= l2t_end || l2t_end >= L2T_SIZE)
 199                 return NULL;
 200         l2t_size = l2t_end - l2t_start + 1;
 201
 202         d = t4_os_alloc(sizeof(*d) + l2t_size * sizeof(struct l2t_entry));
 203         if (!d)
 204                 return NULL;
 205
 206         d->l2t_start = l2t_start;
 207         d->l2t_size = l2t_size;
 208
 209         t4_os_rwlock_init(&d->lock);
 210
 211         for (i = 0; i < d->l2t_size; ++i) {
 212                 d->l2tab[i].idx = i;
 213                 d->l2tab[i].state = L2T_STATE_UNUSED;
 214                 t4_os_lock_init(&d->l2tab[i].lock);
 215                 rte_atomic32_set(&d->l2tab[i].refcnt, 0);
 216         }
 217
 218         return d;
 219 }
 220
 221 /**
 222  * Cleanup L2 Table
 223  */
 224 void t4_cleanup_l2t(struct adapter *adap)
 225 {
 226         if (adap->l2t)
 227                 t4_os_free(adap->l2t);
 228 }